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Elaboration d'une équation linéaire améliorée de la force motrice pour l'adsorption d'éthanol sur le charbon actif.

Determination of an improved linear driving force equation for adsorption of ethanol on activated carbon fiber.

Auteurs : SHARKAWY I. I. el-, SAHA B. B., CHAKRABORTY A., et al.

Résumé

In the paper, the adsorption rate of ethanol on activated carbon fiber (ACF) of type (A-20) has been measured using a thermogravimetric analyser unit over a wide range of adsorption temperatures, which is useful for adsorption chillers design. The mass uptake is measured accurately with a time interval of 0.5 seconds from which the diffusion time constant and consequently, the overall mass transfer coefficient could be evaluated. A novel concentration profile with an exponent parameter k has been proposed in the theoretical model which accounts for the effect of meso- and micro-pore structures with the ACF. The proposed concentration profile removes the restrictions between the overall mass transfer coefficient and the diffusion time constant. Using the measured kinetics, the numerical value of k is evaluated, leading to a new form of linear driving force model for cylindrical adsorbent that could capture the higher ethanol uptake in ACF and this linear driving force model has been validated experimentally.

Détails

  • Titre original : Determination of an improved linear driving force equation for adsorption of ethanol on activated carbon fiber.
  • Identifiant de la fiche : 2007-0657
  • Langues : Anglais
  • Source : ACRA-2006. Proceedings of the 3rd Asian conference on refrigeration and air conditioning.
  • Date d'édition : 21/05/2006

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